<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>事件举例-二级联动</title>
    <style>
         .container{
               margin-left: 500px;
               margin-top: 400px;
         }
    </style>

</head>

<body>

     <div class="container">
          城市: <select name="" id="sltCity"></select>
         学校: <select name="" id="sltSchool"></select>
     </div>

</body>
<script src="../mock/cities.js"></script>
<script src="../js/13.event3.js"></script>
</html>